Solution for desensitizing metal plates used in the lithographic art



Patented May 20, 1941 UNITED STATES PATENT OFFICE SOLUTION FOR DESENSITIZING METAL PLATES USED IN THE LITHOGRAPHIC ART I William N. Misuraca, Merrick, N. Y.

No Drawing. Application March 5, 1938,

1 Serial No. 194,075

2 Claims.

portions of the surface of a metal lithographic plate, which consists of treating the image bearing surface of the plate with an aqueous solution of gum arable and chrome alum.

2. A process of 'desensitlzing the non-printing portions 0! a metal lithographic plate, which consists of creating a hydroscopic film on the plate by the application of an aqueous solution of gum arable and chrome alum.

WiLLIAM N. MISURACA. 

